1 /* 2 * UDP over IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/udp.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14 * a single port at the same time. 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/ipv6.h> 33 #include <linux/icmpv6.h> 34 #include <linux/init.h> 35 #include <linux/module.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <asm/uaccess.h> 39 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/raw.h> 45 #include <net/tcp_states.h> 46 #include <net/ip6_checksum.h> 47 #include <net/xfrm.h> 48 #include <net/inet6_hashtables.h> 49 #include <net/busy_poll.h> 50 51 #include <linux/proc_fs.h> 52 #include <linux/seq_file.h> 53 #include <trace/events/skb.h> 54 #include "udp_impl.h" 55 56 static unsigned int udp6_ehashfn(struct net *net, 57 const struct in6_addr *laddr, 58 const u16 lport, 59 const struct in6_addr *faddr, 60 const __be16 fport) 61 { 62 static u32 udp6_ehash_secret __read_mostly; 63 static u32 udp_ipv6_hash_secret __read_mostly; 64 65 u32 lhash, fhash; 66 67 net_get_random_once(&udp6_ehash_secret, 68 sizeof(udp6_ehash_secret)); 69 net_get_random_once(&udp_ipv6_hash_secret, 70 sizeof(udp_ipv6_hash_secret)); 71 72 lhash = (__force u32)laddr->s6_addr32[3]; 73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 74 75 return __inet6_ehashfn(lhash, lport, fhash, fport, 76 udp_ipv6_hash_secret + net_hash_mix(net)); 77 } 78 79 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 80 { 81 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 82 int sk_ipv6only = ipv6_only_sock(sk); 83 int sk2_ipv6only = inet_v6_ipv6only(sk2); 84 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); 85 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 86 87 /* if both are mapped, treat as IPv4 */ 88 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 89 return (!sk2_ipv6only && 90 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr || 91 sk->sk_rcv_saddr == sk2->sk_rcv_saddr)); 92 93 if (addr_type2 == IPV6_ADDR_ANY && 94 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 95 return 1; 96 97 if (addr_type == IPV6_ADDR_ANY && 98 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 99 return 1; 100 101 if (sk2_rcv_saddr6 && 102 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) 103 return 1; 104 105 return 0; 106 } 107 108 static unsigned int udp6_portaddr_hash(struct net *net, 109 const struct in6_addr *addr6, 110 unsigned int port) 111 { 112 unsigned int hash, mix = net_hash_mix(net); 113 114 if (ipv6_addr_any(addr6)) 115 hash = jhash_1word(0, mix); 116 else if (ipv6_addr_v4mapped(addr6)) 117 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 118 else 119 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 120 121 return hash ^ port; 122 } 123 124 125 int udp_v6_get_port(struct sock *sk, unsigned short snum) 126 { 127 unsigned int hash2_nulladdr = 128 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 129 unsigned int hash2_partial = 130 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 131 132 /* precompute partial secondary hash */ 133 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 134 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 135 } 136 137 static void udp_v6_rehash(struct sock *sk) 138 { 139 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 140 &sk->sk_v6_rcv_saddr, 141 inet_sk(sk)->inet_num); 142 143 udp_lib_rehash(sk, new_hash); 144 } 145 146 static inline int compute_score(struct sock *sk, struct net *net, 147 unsigned short hnum, 148 const struct in6_addr *saddr, __be16 sport, 149 const struct in6_addr *daddr, __be16 dport, 150 int dif) 151 { 152 int score = -1; 153 154 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 155 sk->sk_family == PF_INET6) { 156 struct inet_sock *inet = inet_sk(sk); 157 158 score = 0; 159 if (inet->inet_dport) { 160 if (inet->inet_dport != sport) 161 return -1; 162 score++; 163 } 164 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 165 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 166 return -1; 167 score++; 168 } 169 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 170 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 171 return -1; 172 score++; 173 } 174 if (sk->sk_bound_dev_if) { 175 if (sk->sk_bound_dev_if != dif) 176 return -1; 177 score++; 178 } 179 } 180 return score; 181 } 182 183 #define SCORE2_MAX (1 + 1 + 1) 184 static inline int compute_score2(struct sock *sk, struct net *net, 185 const struct in6_addr *saddr, __be16 sport, 186 const struct in6_addr *daddr, unsigned short hnum, 187 int dif) 188 { 189 int score = -1; 190 191 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 192 sk->sk_family == PF_INET6) { 193 struct inet_sock *inet = inet_sk(sk); 194 195 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 196 return -1; 197 score = 0; 198 if (inet->inet_dport) { 199 if (inet->inet_dport != sport) 200 return -1; 201 score++; 202 } 203 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 204 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 205 return -1; 206 score++; 207 } 208 if (sk->sk_bound_dev_if) { 209 if (sk->sk_bound_dev_if != dif) 210 return -1; 211 score++; 212 } 213 } 214 return score; 215 } 216 217 218 /* called with read_rcu_lock() */ 219 static struct sock *udp6_lib_lookup2(struct net *net, 220 const struct in6_addr *saddr, __be16 sport, 221 const struct in6_addr *daddr, unsigned int hnum, int dif, 222 struct udp_hslot *hslot2, unsigned int slot2) 223 { 224 struct sock *sk, *result; 225 struct hlist_nulls_node *node; 226 int score, badness, matches = 0, reuseport = 0; 227 u32 hash = 0; 228 229 begin: 230 result = NULL; 231 badness = -1; 232 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 233 score = compute_score2(sk, net, saddr, sport, 234 daddr, hnum, dif); 235 if (score > badness) { 236 result = sk; 237 badness = score; 238 reuseport = sk->sk_reuseport; 239 if (reuseport) { 240 hash = udp6_ehashfn(net, daddr, hnum, 241 saddr, sport); 242 matches = 1; 243 } else if (score == SCORE2_MAX) 244 goto exact_match; 245 } else if (score == badness && reuseport) { 246 matches++; 247 if (((u64)hash * matches) >> 32 == 0) 248 result = sk; 249 hash = next_pseudo_random32(hash); 250 } 251 } 252 /* 253 * if the nulls value we got at the end of this lookup is 254 * not the expected one, we must restart lookup. 255 * We probably met an item that was moved to another chain. 256 */ 257 if (get_nulls_value(node) != slot2) 258 goto begin; 259 260 if (result) { 261 exact_match: 262 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 263 result = NULL; 264 else if (unlikely(compute_score2(result, net, saddr, sport, 265 daddr, hnum, dif) < badness)) { 266 sock_put(result); 267 goto begin; 268 } 269 } 270 return result; 271 } 272 273 struct sock *__udp6_lib_lookup(struct net *net, 274 const struct in6_addr *saddr, __be16 sport, 275 const struct in6_addr *daddr, __be16 dport, 276 int dif, struct udp_table *udptable) 277 { 278 struct sock *sk, *result; 279 struct hlist_nulls_node *node; 280 unsigned short hnum = ntohs(dport); 281 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 282 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 283 int score, badness, matches = 0, reuseport = 0; 284 u32 hash = 0; 285 286 rcu_read_lock(); 287 if (hslot->count > 10) { 288 hash2 = udp6_portaddr_hash(net, daddr, hnum); 289 slot2 = hash2 & udptable->mask; 290 hslot2 = &udptable->hash2[slot2]; 291 if (hslot->count < hslot2->count) 292 goto begin; 293 294 result = udp6_lib_lookup2(net, saddr, sport, 295 daddr, hnum, dif, 296 hslot2, slot2); 297 if (!result) { 298 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 299 slot2 = hash2 & udptable->mask; 300 hslot2 = &udptable->hash2[slot2]; 301 if (hslot->count < hslot2->count) 302 goto begin; 303 304 result = udp6_lib_lookup2(net, saddr, sport, 305 &in6addr_any, hnum, dif, 306 hslot2, slot2); 307 } 308 rcu_read_unlock(); 309 return result; 310 } 311 begin: 312 result = NULL; 313 badness = -1; 314 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 315 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 316 if (score > badness) { 317 result = sk; 318 badness = score; 319 reuseport = sk->sk_reuseport; 320 if (reuseport) { 321 hash = udp6_ehashfn(net, daddr, hnum, 322 saddr, sport); 323 matches = 1; 324 } 325 } else if (score == badness && reuseport) { 326 matches++; 327 if (((u64)hash * matches) >> 32 == 0) 328 result = sk; 329 hash = next_pseudo_random32(hash); 330 } 331 } 332 /* 333 * if the nulls value we got at the end of this lookup is 334 * not the expected one, we must restart lookup. 335 * We probably met an item that was moved to another chain. 336 */ 337 if (get_nulls_value(node) != slot) 338 goto begin; 339 340 if (result) { 341 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 342 result = NULL; 343 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 344 daddr, dport, dif) < badness)) { 345 sock_put(result); 346 goto begin; 347 } 348 } 349 rcu_read_unlock(); 350 return result; 351 } 352 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 353 354 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 355 __be16 sport, __be16 dport, 356 struct udp_table *udptable) 357 { 358 struct sock *sk; 359 const struct ipv6hdr *iph = ipv6_hdr(skb); 360 361 if (unlikely(sk = skb_steal_sock(skb))) 362 return sk; 363 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 364 &iph->daddr, dport, inet6_iif(skb), 365 udptable); 366 } 367 368 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 369 const struct in6_addr *daddr, __be16 dport, int dif) 370 { 371 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 372 } 373 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 374 375 376 /* 377 * This should be easy, if there is something there we 378 * return it, otherwise we block. 379 */ 380 381 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 382 struct msghdr *msg, size_t len, 383 int noblock, int flags, int *addr_len) 384 { 385 struct ipv6_pinfo *np = inet6_sk(sk); 386 struct inet_sock *inet = inet_sk(sk); 387 struct sk_buff *skb; 388 unsigned int ulen, copied; 389 int peeked, off = 0; 390 int err; 391 int is_udplite = IS_UDPLITE(sk); 392 int is_udp4; 393 bool slow; 394 395 if (flags & MSG_ERRQUEUE) 396 return ipv6_recv_error(sk, msg, len, addr_len); 397 398 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 399 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 400 401 try_again: 402 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 403 &peeked, &off, &err); 404 if (!skb) 405 goto out; 406 407 ulen = skb->len - sizeof(struct udphdr); 408 copied = len; 409 if (copied > ulen) 410 copied = ulen; 411 else if (copied < ulen) 412 msg->msg_flags |= MSG_TRUNC; 413 414 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 415 416 /* 417 * If checksum is needed at all, try to do it while copying the 418 * data. If the data is truncated, or if we only want a partial 419 * coverage checksum (UDP-Lite), do it before the copy. 420 */ 421 422 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 423 if (udp_lib_checksum_complete(skb)) 424 goto csum_copy_err; 425 } 426 427 if (skb_csum_unnecessary(skb)) 428 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 429 msg->msg_iov, copied); 430 else { 431 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 432 if (err == -EINVAL) 433 goto csum_copy_err; 434 } 435 if (unlikely(err)) { 436 trace_kfree_skb(skb, udpv6_recvmsg); 437 if (!peeked) { 438 atomic_inc(&sk->sk_drops); 439 if (is_udp4) 440 UDP_INC_STATS_USER(sock_net(sk), 441 UDP_MIB_INERRORS, 442 is_udplite); 443 else 444 UDP6_INC_STATS_USER(sock_net(sk), 445 UDP_MIB_INERRORS, 446 is_udplite); 447 } 448 goto out_free; 449 } 450 if (!peeked) { 451 if (is_udp4) 452 UDP_INC_STATS_USER(sock_net(sk), 453 UDP_MIB_INDATAGRAMS, is_udplite); 454 else 455 UDP6_INC_STATS_USER(sock_net(sk), 456 UDP_MIB_INDATAGRAMS, is_udplite); 457 } 458 459 sock_recv_ts_and_drops(msg, sk, skb); 460 461 /* Copy the address. */ 462 if (msg->msg_name) { 463 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 464 sin6->sin6_family = AF_INET6; 465 sin6->sin6_port = udp_hdr(skb)->source; 466 sin6->sin6_flowinfo = 0; 467 468 if (is_udp4) { 469 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 470 &sin6->sin6_addr); 471 sin6->sin6_scope_id = 0; 472 } else { 473 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 474 sin6->sin6_scope_id = 475 ipv6_iface_scope_id(&sin6->sin6_addr, 476 IP6CB(skb)->iif); 477 } 478 *addr_len = sizeof(*sin6); 479 } 480 481 if (np->rxopt.all) 482 ip6_datagram_recv_common_ctl(sk, msg, skb); 483 484 if (is_udp4) { 485 if (inet->cmsg_flags) 486 ip_cmsg_recv(msg, skb); 487 } else { 488 if (np->rxopt.all) 489 ip6_datagram_recv_specific_ctl(sk, msg, skb); 490 } 491 492 err = copied; 493 if (flags & MSG_TRUNC) 494 err = ulen; 495 496 out_free: 497 skb_free_datagram_locked(sk, skb); 498 out: 499 return err; 500 501 csum_copy_err: 502 slow = lock_sock_fast(sk); 503 if (!skb_kill_datagram(sk, skb, flags)) { 504 if (is_udp4) { 505 UDP_INC_STATS_USER(sock_net(sk), 506 UDP_MIB_CSUMERRORS, is_udplite); 507 UDP_INC_STATS_USER(sock_net(sk), 508 UDP_MIB_INERRORS, is_udplite); 509 } else { 510 UDP6_INC_STATS_USER(sock_net(sk), 511 UDP_MIB_CSUMERRORS, is_udplite); 512 UDP6_INC_STATS_USER(sock_net(sk), 513 UDP_MIB_INERRORS, is_udplite); 514 } 515 } 516 unlock_sock_fast(sk, slow); 517 518 if (noblock) 519 return -EAGAIN; 520 521 /* starting over for a new packet */ 522 msg->msg_flags &= ~MSG_TRUNC; 523 goto try_again; 524 } 525 526 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 527 u8 type, u8 code, int offset, __be32 info, 528 struct udp_table *udptable) 529 { 530 struct ipv6_pinfo *np; 531 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 532 const struct in6_addr *saddr = &hdr->saddr; 533 const struct in6_addr *daddr = &hdr->daddr; 534 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 535 struct sock *sk; 536 int err; 537 538 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 539 saddr, uh->source, inet6_iif(skb), udptable); 540 if (sk == NULL) 541 return; 542 543 if (type == ICMPV6_PKT_TOOBIG) { 544 if (!ip6_sk_accept_pmtu(sk)) 545 goto out; 546 ip6_sk_update_pmtu(skb, sk, info); 547 } 548 if (type == NDISC_REDIRECT) { 549 ip6_sk_redirect(skb, sk); 550 goto out; 551 } 552 553 np = inet6_sk(sk); 554 555 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 556 goto out; 557 558 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 559 goto out; 560 561 if (np->recverr) 562 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 563 564 sk->sk_err = err; 565 sk->sk_error_report(sk); 566 out: 567 sock_put(sk); 568 } 569 570 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 571 { 572 int rc; 573 574 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 575 sock_rps_save_rxhash(sk, skb); 576 sk_mark_napi_id(sk, skb); 577 } 578 579 rc = sock_queue_rcv_skb(sk, skb); 580 if (rc < 0) { 581 int is_udplite = IS_UDPLITE(sk); 582 583 /* Note that an ENOMEM error is charged twice */ 584 if (rc == -ENOMEM) 585 UDP6_INC_STATS_BH(sock_net(sk), 586 UDP_MIB_RCVBUFERRORS, is_udplite); 587 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 588 kfree_skb(skb); 589 return -1; 590 } 591 return 0; 592 } 593 594 static __inline__ void udpv6_err(struct sk_buff *skb, 595 struct inet6_skb_parm *opt, u8 type, 596 u8 code, int offset, __be32 info ) 597 { 598 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 599 } 600 601 static struct static_key udpv6_encap_needed __read_mostly; 602 void udpv6_encap_enable(void) 603 { 604 if (!static_key_enabled(&udpv6_encap_needed)) 605 static_key_slow_inc(&udpv6_encap_needed); 606 } 607 EXPORT_SYMBOL(udpv6_encap_enable); 608 609 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 610 { 611 struct udp_sock *up = udp_sk(sk); 612 int rc; 613 int is_udplite = IS_UDPLITE(sk); 614 615 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 616 goto drop; 617 618 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 619 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 620 621 /* 622 * This is an encapsulation socket so pass the skb to 623 * the socket's udp_encap_rcv() hook. Otherwise, just 624 * fall through and pass this up the UDP socket. 625 * up->encap_rcv() returns the following value: 626 * =0 if skb was successfully passed to the encap 627 * handler or was discarded by it. 628 * >0 if skb should be passed on to UDP. 629 * <0 if skb should be resubmitted as proto -N 630 */ 631 632 /* if we're overly short, let UDP handle it */ 633 encap_rcv = ACCESS_ONCE(up->encap_rcv); 634 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 635 int ret; 636 637 /* Verify checksum before giving to encap */ 638 if (udp_lib_checksum_complete(skb)) 639 goto csum_error; 640 641 ret = encap_rcv(sk, skb); 642 if (ret <= 0) { 643 UDP_INC_STATS_BH(sock_net(sk), 644 UDP_MIB_INDATAGRAMS, 645 is_udplite); 646 return -ret; 647 } 648 } 649 650 /* FALLTHROUGH -- it's a UDP Packet */ 651 } 652 653 /* 654 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 655 */ 656 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 657 658 if (up->pcrlen == 0) { /* full coverage was set */ 659 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 660 " %d while full coverage %d requested\n", 661 UDP_SKB_CB(skb)->cscov, skb->len); 662 goto drop; 663 } 664 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 665 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 666 "too small, need min %d\n", 667 UDP_SKB_CB(skb)->cscov, up->pcrlen); 668 goto drop; 669 } 670 } 671 672 if (rcu_access_pointer(sk->sk_filter)) { 673 if (udp_lib_checksum_complete(skb)) 674 goto csum_error; 675 } 676 677 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 678 goto drop; 679 680 skb_dst_drop(skb); 681 682 bh_lock_sock(sk); 683 rc = 0; 684 if (!sock_owned_by_user(sk)) 685 rc = __udpv6_queue_rcv_skb(sk, skb); 686 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 687 bh_unlock_sock(sk); 688 goto drop; 689 } 690 bh_unlock_sock(sk); 691 692 return rc; 693 csum_error: 694 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 695 drop: 696 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 697 atomic_inc(&sk->sk_drops); 698 kfree_skb(skb); 699 return -1; 700 } 701 702 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 703 __be16 loc_port, const struct in6_addr *loc_addr, 704 __be16 rmt_port, const struct in6_addr *rmt_addr, 705 int dif) 706 { 707 struct hlist_nulls_node *node; 708 unsigned short num = ntohs(loc_port); 709 710 sk_nulls_for_each_from(sk, node) { 711 struct inet_sock *inet = inet_sk(sk); 712 713 if (!net_eq(sock_net(sk), net)) 714 continue; 715 716 if (udp_sk(sk)->udp_port_hash == num && 717 sk->sk_family == PF_INET6) { 718 if (inet->inet_dport) { 719 if (inet->inet_dport != rmt_port) 720 continue; 721 } 722 if (!ipv6_addr_any(&sk->sk_v6_daddr) && 723 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) 724 continue; 725 726 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 727 continue; 728 729 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 730 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)) 731 continue; 732 } 733 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 734 continue; 735 return sk; 736 } 737 } 738 return NULL; 739 } 740 741 static void flush_stack(struct sock **stack, unsigned int count, 742 struct sk_buff *skb, unsigned int final) 743 { 744 struct sk_buff *skb1 = NULL; 745 struct sock *sk; 746 unsigned int i; 747 748 for (i = 0; i < count; i++) { 749 sk = stack[i]; 750 if (likely(skb1 == NULL)) 751 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 752 if (!skb1) { 753 atomic_inc(&sk->sk_drops); 754 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 755 IS_UDPLITE(sk)); 756 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 757 IS_UDPLITE(sk)); 758 } 759 760 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 761 skb1 = NULL; 762 } 763 if (unlikely(skb1)) 764 kfree_skb(skb1); 765 } 766 767 static void udp6_csum_zero_error(struct sk_buff *skb) 768 { 769 /* RFC 2460 section 8.1 says that we SHOULD log 770 * this error. Well, it is reasonable. 771 */ 772 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 773 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 774 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 775 } 776 777 /* 778 * Note: called only from the BH handler context, 779 * so we don't need to lock the hashes. 780 */ 781 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 782 const struct in6_addr *saddr, const struct in6_addr *daddr, 783 struct udp_table *udptable) 784 { 785 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 786 const struct udphdr *uh = udp_hdr(skb); 787 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 788 int dif; 789 unsigned int i, count = 0; 790 791 spin_lock(&hslot->lock); 792 sk = sk_nulls_head(&hslot->head); 793 dif = inet6_iif(skb); 794 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 795 while (sk) { 796 /* If zero checksum and no_check is not on for 797 * the socket then skip it. 798 */ 799 if (uh->check || udp_sk(sk)->no_check6_rx) 800 stack[count++] = sk; 801 802 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 803 uh->source, saddr, dif); 804 if (unlikely(count == ARRAY_SIZE(stack))) { 805 if (!sk) 806 break; 807 flush_stack(stack, count, skb, ~0); 808 count = 0; 809 } 810 } 811 /* 812 * before releasing the lock, we must take reference on sockets 813 */ 814 for (i = 0; i < count; i++) 815 sock_hold(stack[i]); 816 817 spin_unlock(&hslot->lock); 818 819 if (count) { 820 flush_stack(stack, count, skb, count - 1); 821 822 for (i = 0; i < count; i++) 823 sock_put(stack[i]); 824 } else { 825 kfree_skb(skb); 826 } 827 return 0; 828 } 829 830 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 831 int proto) 832 { 833 struct net *net = dev_net(skb->dev); 834 struct sock *sk; 835 struct udphdr *uh; 836 const struct in6_addr *saddr, *daddr; 837 u32 ulen = 0; 838 839 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 840 goto discard; 841 842 saddr = &ipv6_hdr(skb)->saddr; 843 daddr = &ipv6_hdr(skb)->daddr; 844 uh = udp_hdr(skb); 845 846 ulen = ntohs(uh->len); 847 if (ulen > skb->len) 848 goto short_packet; 849 850 if (proto == IPPROTO_UDP) { 851 /* UDP validates ulen. */ 852 853 /* Check for jumbo payload */ 854 if (ulen == 0) 855 ulen = skb->len; 856 857 if (ulen < sizeof(*uh)) 858 goto short_packet; 859 860 if (ulen < skb->len) { 861 if (pskb_trim_rcsum(skb, ulen)) 862 goto short_packet; 863 saddr = &ipv6_hdr(skb)->saddr; 864 daddr = &ipv6_hdr(skb)->daddr; 865 uh = udp_hdr(skb); 866 } 867 } 868 869 if (udp6_csum_init(skb, uh, proto)) 870 goto csum_error; 871 872 /* 873 * Multicast receive code 874 */ 875 if (ipv6_addr_is_multicast(daddr)) 876 return __udp6_lib_mcast_deliver(net, skb, 877 saddr, daddr, udptable); 878 879 /* Unicast */ 880 881 /* 882 * check socket cache ... must talk to Alan about his plans 883 * for sock caches... i'll skip this for now. 884 */ 885 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 886 if (sk != NULL) { 887 int ret; 888 889 if (!uh->check && !udp_sk(sk)->no_check6_rx) { 890 sock_put(sk); 891 udp6_csum_zero_error(skb); 892 goto csum_error; 893 } 894 895 ret = udpv6_queue_rcv_skb(sk, skb); 896 sock_put(sk); 897 898 /* a return value > 0 means to resubmit the input, but 899 * it wants the return to be -protocol, or 0 900 */ 901 if (ret > 0) 902 return -ret; 903 904 return 0; 905 } 906 907 if (!uh->check) { 908 udp6_csum_zero_error(skb); 909 goto csum_error; 910 } 911 912 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 913 goto discard; 914 915 if (udp_lib_checksum_complete(skb)) 916 goto csum_error; 917 918 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 919 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 920 921 kfree_skb(skb); 922 return 0; 923 924 short_packet: 925 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 926 proto == IPPROTO_UDPLITE ? "-Lite" : "", 927 saddr, 928 ntohs(uh->source), 929 ulen, 930 skb->len, 931 daddr, 932 ntohs(uh->dest)); 933 goto discard; 934 csum_error: 935 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 936 discard: 937 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 938 kfree_skb(skb); 939 return 0; 940 } 941 942 static __inline__ int udpv6_rcv(struct sk_buff *skb) 943 { 944 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 945 } 946 947 /* 948 * Throw away all pending data and cancel the corking. Socket is locked. 949 */ 950 static void udp_v6_flush_pending_frames(struct sock *sk) 951 { 952 struct udp_sock *up = udp_sk(sk); 953 954 if (up->pending == AF_INET) 955 udp_flush_pending_frames(sk); 956 else if (up->pending) { 957 up->len = 0; 958 up->pending = 0; 959 ip6_flush_pending_frames(sk); 960 } 961 } 962 963 /** 964 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 965 * @sk: socket we are sending on 966 * @skb: sk_buff containing the filled-in UDP header 967 * (checksum field must be zeroed out) 968 */ 969 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 970 const struct in6_addr *saddr, 971 const struct in6_addr *daddr, int len) 972 { 973 unsigned int offset; 974 struct udphdr *uh = udp_hdr(skb); 975 __wsum csum = 0; 976 977 if (skb_queue_len(&sk->sk_write_queue) == 1) { 978 /* Only one fragment on the socket. */ 979 skb->csum_start = skb_transport_header(skb) - skb->head; 980 skb->csum_offset = offsetof(struct udphdr, check); 981 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 982 } else { 983 /* 984 * HW-checksum won't work as there are two or more 985 * fragments on the socket so that all csums of sk_buffs 986 * should be together 987 */ 988 offset = skb_transport_offset(skb); 989 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 990 991 skb->ip_summed = CHECKSUM_NONE; 992 993 skb_queue_walk(&sk->sk_write_queue, skb) { 994 csum = csum_add(csum, skb->csum); 995 } 996 997 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 998 csum); 999 if (uh->check == 0) 1000 uh->check = CSUM_MANGLED_0; 1001 } 1002 } 1003 1004 /* 1005 * Sending 1006 */ 1007 1008 static int udp_v6_push_pending_frames(struct sock *sk) 1009 { 1010 struct sk_buff *skb; 1011 struct udphdr *uh; 1012 struct udp_sock *up = udp_sk(sk); 1013 struct inet_sock *inet = inet_sk(sk); 1014 struct flowi6 *fl6; 1015 int err = 0; 1016 int is_udplite = IS_UDPLITE(sk); 1017 __wsum csum = 0; 1018 1019 if (up->pending == AF_INET) 1020 return udp_push_pending_frames(sk); 1021 1022 fl6 = &inet->cork.fl.u.ip6; 1023 1024 /* Grab the skbuff where UDP header space exists. */ 1025 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 1026 goto out; 1027 1028 /* 1029 * Create a UDP header 1030 */ 1031 uh = udp_hdr(skb); 1032 uh->source = fl6->fl6_sport; 1033 uh->dest = fl6->fl6_dport; 1034 uh->len = htons(up->len); 1035 uh->check = 0; 1036 1037 if (is_udplite) 1038 csum = udplite_csum_outgoing(sk, skb); 1039 else if (up->no_check6_tx) { /* UDP csum disabled */ 1040 skb->ip_summed = CHECKSUM_NONE; 1041 goto send; 1042 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1043 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 1044 up->len); 1045 goto send; 1046 } else 1047 csum = udp_csum_outgoing(sk, skb); 1048 1049 /* add protocol-dependent pseudo-header */ 1050 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1051 up->len, fl6->flowi6_proto, csum); 1052 if (uh->check == 0) 1053 uh->check = CSUM_MANGLED_0; 1054 1055 send: 1056 err = ip6_push_pending_frames(sk); 1057 if (err) { 1058 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 1059 UDP6_INC_STATS_USER(sock_net(sk), 1060 UDP_MIB_SNDBUFERRORS, is_udplite); 1061 err = 0; 1062 } 1063 } else 1064 UDP6_INC_STATS_USER(sock_net(sk), 1065 UDP_MIB_OUTDATAGRAMS, is_udplite); 1066 out: 1067 up->len = 0; 1068 up->pending = 0; 1069 return err; 1070 } 1071 1072 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1073 struct msghdr *msg, size_t len) 1074 { 1075 struct ipv6_txoptions opt_space; 1076 struct udp_sock *up = udp_sk(sk); 1077 struct inet_sock *inet = inet_sk(sk); 1078 struct ipv6_pinfo *np = inet6_sk(sk); 1079 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1080 struct in6_addr *daddr, *final_p, final; 1081 struct ipv6_txoptions *opt = NULL; 1082 struct ip6_flowlabel *flowlabel = NULL; 1083 struct flowi6 fl6; 1084 struct dst_entry *dst; 1085 int addr_len = msg->msg_namelen; 1086 int ulen = len; 1087 int hlimit = -1; 1088 int tclass = -1; 1089 int dontfrag = -1; 1090 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1091 int err; 1092 int connected = 0; 1093 int is_udplite = IS_UDPLITE(sk); 1094 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1095 1096 /* destination address check */ 1097 if (sin6) { 1098 if (addr_len < offsetof(struct sockaddr, sa_data)) 1099 return -EINVAL; 1100 1101 switch (sin6->sin6_family) { 1102 case AF_INET6: 1103 if (addr_len < SIN6_LEN_RFC2133) 1104 return -EINVAL; 1105 daddr = &sin6->sin6_addr; 1106 break; 1107 case AF_INET: 1108 goto do_udp_sendmsg; 1109 case AF_UNSPEC: 1110 msg->msg_name = sin6 = NULL; 1111 msg->msg_namelen = addr_len = 0; 1112 daddr = NULL; 1113 break; 1114 default: 1115 return -EINVAL; 1116 } 1117 } else if (!up->pending) { 1118 if (sk->sk_state != TCP_ESTABLISHED) 1119 return -EDESTADDRREQ; 1120 daddr = &sk->sk_v6_daddr; 1121 } else 1122 daddr = NULL; 1123 1124 if (daddr) { 1125 if (ipv6_addr_v4mapped(daddr)) { 1126 struct sockaddr_in sin; 1127 sin.sin_family = AF_INET; 1128 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1129 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1130 msg->msg_name = &sin; 1131 msg->msg_namelen = sizeof(sin); 1132 do_udp_sendmsg: 1133 if (__ipv6_only_sock(sk)) 1134 return -ENETUNREACH; 1135 return udp_sendmsg(iocb, sk, msg, len); 1136 } 1137 } 1138 1139 if (up->pending == AF_INET) 1140 return udp_sendmsg(iocb, sk, msg, len); 1141 1142 /* Rough check on arithmetic overflow, 1143 better check is made in ip6_append_data(). 1144 */ 1145 if (len > INT_MAX - sizeof(struct udphdr)) 1146 return -EMSGSIZE; 1147 1148 if (up->pending) { 1149 /* 1150 * There are pending frames. 1151 * The socket lock must be held while it's corked. 1152 */ 1153 lock_sock(sk); 1154 if (likely(up->pending)) { 1155 if (unlikely(up->pending != AF_INET6)) { 1156 release_sock(sk); 1157 return -EAFNOSUPPORT; 1158 } 1159 dst = NULL; 1160 goto do_append_data; 1161 } 1162 release_sock(sk); 1163 } 1164 ulen += sizeof(struct udphdr); 1165 1166 memset(&fl6, 0, sizeof(fl6)); 1167 1168 if (sin6) { 1169 if (sin6->sin6_port == 0) 1170 return -EINVAL; 1171 1172 fl6.fl6_dport = sin6->sin6_port; 1173 daddr = &sin6->sin6_addr; 1174 1175 if (np->sndflow) { 1176 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1177 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1178 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1179 if (flowlabel == NULL) 1180 return -EINVAL; 1181 } 1182 } 1183 1184 /* 1185 * Otherwise it will be difficult to maintain 1186 * sk->sk_dst_cache. 1187 */ 1188 if (sk->sk_state == TCP_ESTABLISHED && 1189 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1190 daddr = &sk->sk_v6_daddr; 1191 1192 if (addr_len >= sizeof(struct sockaddr_in6) && 1193 sin6->sin6_scope_id && 1194 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1195 fl6.flowi6_oif = sin6->sin6_scope_id; 1196 } else { 1197 if (sk->sk_state != TCP_ESTABLISHED) 1198 return -EDESTADDRREQ; 1199 1200 fl6.fl6_dport = inet->inet_dport; 1201 daddr = &sk->sk_v6_daddr; 1202 fl6.flowlabel = np->flow_label; 1203 connected = 1; 1204 } 1205 1206 if (!fl6.flowi6_oif) 1207 fl6.flowi6_oif = sk->sk_bound_dev_if; 1208 1209 if (!fl6.flowi6_oif) 1210 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1211 1212 fl6.flowi6_mark = sk->sk_mark; 1213 1214 if (msg->msg_controllen) { 1215 opt = &opt_space; 1216 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1217 opt->tot_len = sizeof(*opt); 1218 1219 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1220 &hlimit, &tclass, &dontfrag); 1221 if (err < 0) { 1222 fl6_sock_release(flowlabel); 1223 return err; 1224 } 1225 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1226 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1227 if (flowlabel == NULL) 1228 return -EINVAL; 1229 } 1230 if (!(opt->opt_nflen|opt->opt_flen)) 1231 opt = NULL; 1232 connected = 0; 1233 } 1234 if (opt == NULL) 1235 opt = np->opt; 1236 if (flowlabel) 1237 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1238 opt = ipv6_fixup_options(&opt_space, opt); 1239 1240 fl6.flowi6_proto = sk->sk_protocol; 1241 if (!ipv6_addr_any(daddr)) 1242 fl6.daddr = *daddr; 1243 else 1244 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1245 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1246 fl6.saddr = np->saddr; 1247 fl6.fl6_sport = inet->inet_sport; 1248 1249 final_p = fl6_update_dst(&fl6, opt, &final); 1250 if (final_p) 1251 connected = 0; 1252 1253 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1254 fl6.flowi6_oif = np->mcast_oif; 1255 connected = 0; 1256 } else if (!fl6.flowi6_oif) 1257 fl6.flowi6_oif = np->ucast_oif; 1258 1259 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1260 1261 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 1262 if (IS_ERR(dst)) { 1263 err = PTR_ERR(dst); 1264 dst = NULL; 1265 goto out; 1266 } 1267 1268 if (hlimit < 0) 1269 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1270 1271 if (tclass < 0) 1272 tclass = np->tclass; 1273 1274 if (msg->msg_flags&MSG_CONFIRM) 1275 goto do_confirm; 1276 back_from_confirm: 1277 1278 lock_sock(sk); 1279 if (unlikely(up->pending)) { 1280 /* The socket is already corked while preparing it. */ 1281 /* ... which is an evident application bug. --ANK */ 1282 release_sock(sk); 1283 1284 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1285 err = -EINVAL; 1286 goto out; 1287 } 1288 1289 up->pending = AF_INET6; 1290 1291 do_append_data: 1292 if (dontfrag < 0) 1293 dontfrag = np->dontfrag; 1294 up->len += ulen; 1295 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1296 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1297 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1298 (struct rt6_info*)dst, 1299 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1300 if (err) 1301 udp_v6_flush_pending_frames(sk); 1302 else if (!corkreq) 1303 err = udp_v6_push_pending_frames(sk); 1304 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1305 up->pending = 0; 1306 1307 if (dst) { 1308 if (connected) { 1309 ip6_dst_store(sk, dst, 1310 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1311 &sk->sk_v6_daddr : NULL, 1312 #ifdef CONFIG_IPV6_SUBTREES 1313 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1314 &np->saddr : 1315 #endif 1316 NULL); 1317 } else { 1318 dst_release(dst); 1319 } 1320 dst = NULL; 1321 } 1322 1323 if (err > 0) 1324 err = np->recverr ? net_xmit_errno(err) : 0; 1325 release_sock(sk); 1326 out: 1327 dst_release(dst); 1328 fl6_sock_release(flowlabel); 1329 if (!err) 1330 return len; 1331 /* 1332 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1333 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1334 * we don't have a good statistic (IpOutDiscards but it can be too many 1335 * things). We could add another new stat but at least for now that 1336 * seems like overkill. 1337 */ 1338 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1339 UDP6_INC_STATS_USER(sock_net(sk), 1340 UDP_MIB_SNDBUFERRORS, is_udplite); 1341 } 1342 return err; 1343 1344 do_confirm: 1345 dst_confirm(dst); 1346 if (!(msg->msg_flags&MSG_PROBE) || len) 1347 goto back_from_confirm; 1348 err = 0; 1349 goto out; 1350 } 1351 1352 void udpv6_destroy_sock(struct sock *sk) 1353 { 1354 struct udp_sock *up = udp_sk(sk); 1355 lock_sock(sk); 1356 udp_v6_flush_pending_frames(sk); 1357 release_sock(sk); 1358 1359 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1360 void (*encap_destroy)(struct sock *sk); 1361 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1362 if (encap_destroy) 1363 encap_destroy(sk); 1364 } 1365 1366 inet6_destroy_sock(sk); 1367 } 1368 1369 /* 1370 * Socket option code for UDP 1371 */ 1372 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1373 char __user *optval, unsigned int optlen) 1374 { 1375 if (level == SOL_UDP || level == SOL_UDPLITE) 1376 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1377 udp_v6_push_pending_frames); 1378 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1379 } 1380 1381 #ifdef CONFIG_COMPAT 1382 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1383 char __user *optval, unsigned int optlen) 1384 { 1385 if (level == SOL_UDP || level == SOL_UDPLITE) 1386 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1387 udp_v6_push_pending_frames); 1388 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1389 } 1390 #endif 1391 1392 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1393 char __user *optval, int __user *optlen) 1394 { 1395 if (level == SOL_UDP || level == SOL_UDPLITE) 1396 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1397 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1398 } 1399 1400 #ifdef CONFIG_COMPAT 1401 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1402 char __user *optval, int __user *optlen) 1403 { 1404 if (level == SOL_UDP || level == SOL_UDPLITE) 1405 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1406 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1407 } 1408 #endif 1409 1410 static const struct inet6_protocol udpv6_protocol = { 1411 .handler = udpv6_rcv, 1412 .err_handler = udpv6_err, 1413 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1414 }; 1415 1416 /* ------------------------------------------------------------------------ */ 1417 #ifdef CONFIG_PROC_FS 1418 int udp6_seq_show(struct seq_file *seq, void *v) 1419 { 1420 if (v == SEQ_START_TOKEN) { 1421 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1422 } else { 1423 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1424 struct inet_sock *inet = inet_sk(v); 1425 __u16 srcp = ntohs(inet->inet_sport); 1426 __u16 destp = ntohs(inet->inet_dport); 1427 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1428 } 1429 return 0; 1430 } 1431 1432 static const struct file_operations udp6_afinfo_seq_fops = { 1433 .owner = THIS_MODULE, 1434 .open = udp_seq_open, 1435 .read = seq_read, 1436 .llseek = seq_lseek, 1437 .release = seq_release_net 1438 }; 1439 1440 static struct udp_seq_afinfo udp6_seq_afinfo = { 1441 .name = "udp6", 1442 .family = AF_INET6, 1443 .udp_table = &udp_table, 1444 .seq_fops = &udp6_afinfo_seq_fops, 1445 .seq_ops = { 1446 .show = udp6_seq_show, 1447 }, 1448 }; 1449 1450 int __net_init udp6_proc_init(struct net *net) 1451 { 1452 return udp_proc_register(net, &udp6_seq_afinfo); 1453 } 1454 1455 void udp6_proc_exit(struct net *net) { 1456 udp_proc_unregister(net, &udp6_seq_afinfo); 1457 } 1458 #endif /* CONFIG_PROC_FS */ 1459 1460 void udp_v6_clear_sk(struct sock *sk, int size) 1461 { 1462 struct inet_sock *inet = inet_sk(sk); 1463 1464 /* we do not want to clear pinet6 field, because of RCU lookups */ 1465 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1466 1467 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1468 memset(&inet->pinet6 + 1, 0, size); 1469 } 1470 1471 /* ------------------------------------------------------------------------ */ 1472 1473 struct proto udpv6_prot = { 1474 .name = "UDPv6", 1475 .owner = THIS_MODULE, 1476 .close = udp_lib_close, 1477 .connect = ip6_datagram_connect, 1478 .disconnect = udp_disconnect, 1479 .ioctl = udp_ioctl, 1480 .destroy = udpv6_destroy_sock, 1481 .setsockopt = udpv6_setsockopt, 1482 .getsockopt = udpv6_getsockopt, 1483 .sendmsg = udpv6_sendmsg, 1484 .recvmsg = udpv6_recvmsg, 1485 .backlog_rcv = __udpv6_queue_rcv_skb, 1486 .hash = udp_lib_hash, 1487 .unhash = udp_lib_unhash, 1488 .rehash = udp_v6_rehash, 1489 .get_port = udp_v6_get_port, 1490 .memory_allocated = &udp_memory_allocated, 1491 .sysctl_mem = sysctl_udp_mem, 1492 .sysctl_wmem = &sysctl_udp_wmem_min, 1493 .sysctl_rmem = &sysctl_udp_rmem_min, 1494 .obj_size = sizeof(struct udp6_sock), 1495 .slab_flags = SLAB_DESTROY_BY_RCU, 1496 .h.udp_table = &udp_table, 1497 #ifdef CONFIG_COMPAT 1498 .compat_setsockopt = compat_udpv6_setsockopt, 1499 .compat_getsockopt = compat_udpv6_getsockopt, 1500 #endif 1501 .clear_sk = udp_v6_clear_sk, 1502 }; 1503 1504 static struct inet_protosw udpv6_protosw = { 1505 .type = SOCK_DGRAM, 1506 .protocol = IPPROTO_UDP, 1507 .prot = &udpv6_prot, 1508 .ops = &inet6_dgram_ops, 1509 .flags = INET_PROTOSW_PERMANENT, 1510 }; 1511 1512 1513 int __init udpv6_init(void) 1514 { 1515 int ret; 1516 1517 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1518 if (ret) 1519 goto out; 1520 1521 ret = inet6_register_protosw(&udpv6_protosw); 1522 if (ret) 1523 goto out_udpv6_protocol; 1524 out: 1525 return ret; 1526 1527 out_udpv6_protocol: 1528 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1529 goto out; 1530 } 1531 1532 void udpv6_exit(void) 1533 { 1534 inet6_unregister_protosw(&udpv6_protosw); 1535 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1536 } 1537